Electric lamp unit



K. WIEGAND 2,056,633

ELECTRIC LAMP UNIT Filed March 5, 1935 19 19 4 ,f 4* 17 Il .5 f4 i is: 9 16 'II ,l

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INVENTOR MW MNM/75H9@ TORNEY -ri-U-NiTED STATE Patented Oct. 6, 1936 s lferriENT oFFicE ELECTRIC LAMP UNIT poration of New York Application March 5, 1935, Serial No. 9,513 In Germany March 8, 1934 1 Claim.

The present invention relates to electric lamp units generally and more particularly the invention relates to lamp units comprising a gaseous electric discharge lamp device and a heat conservator for said lamp device.

'Ihe object of the invention is to provide an efficient lamp unit of the above type which is of simple structure and which is easily assembled. Still further objects and advantages attaching to the device and to its use and operation will be apparent to those skilled in the art from the following particular description.

In. accordance with this object the invention comprises an elongated, tubular, double walled glass vessel, closed at one end thereof and open at the other end thereof and in which the gaseous electric discharge lamp device is mounted. The double-walled glass vessel is a heat conservator for said lamp device. Said lamp device is an elongated tubular one having electrodes mounted at the respective ends thereof and the diameter thereof closely approaches the diameter of the inner wall of sai-d heat conservator. A removable base is provided for and closes the open end of said heat conservator and said base accommodates and supports one end of said lamp device. An electrical contact for the other end of said lamp is pro-vided in the closed end of said conservator. The lamp, the conservator and the removable base are easily assembled into a lamp unit.

In the drawing accompanying and forming part of this specification an embodiment of the invention is shown in a front elevational, partly sectional view.

Referring to the drawing the new and novel lamp unit comprises a gaseous electric discharge lampi device having an elongated tubular container I. Said container I has a gaseous atmosphere therein, such as a mixture of a rare, starting gas, such as neon, and a metal vapor, such as sodium vapor. An electrode 2 is sealed into each end of said container I. Said electrodes 2 consists of a U-shape-d bar of electron emitting material, such as barium oxide, and a iilament, such as a tungsten or a nickel filament, wrapped around said bar. Said electrodes 2 are electron emitting when heated. Said container I has a conical, single pole base 3 fastened to one end thereof and at the other end thereof a two-pole, bayonet base 6. Said base 6 has a pair of contacts 4 and a pair of pins 5 thereon.

The heat conservator of the new and novel lamp unit consists of two concentric tubes 1, each of which tapers conically at one end there- (Cl. 24U-11.4)

of, and which are fused together at the opposite end thereof to form a ring welt 9. The heat conservator is thus open at one end and closed at the other end. The space between the walls of said conservator is evacuated when desired or filled with a gas having poor heat conductivity characteristics. Said conservator reduces the heat losses from the lamp which operates at a higher temperature, a higher vapor pressure and greater efciency than it would without said heat conservator. A base I having a contact pin I2 is fastened to the conical end 8 of the outer tube of the heat conservator by a body of cement I I. A current lead I3 is fastened to said contact pin I2 and is fused into the end of heat conservator l, terminating in a contact in the interior of the closed end of the heat conservator.

The open end of said heat conservator 'I is closed by the base I4 which is removably attached to the conservator 'I by a slot in said base I4 accommodating the pin I5 of the ring I5 which ring I6 is cemented to the outer surface of the outer wall of the heat conservator l. The base I4 has a slotted sleeve I'I in which the bayonet base 6 of the container I, is fastened by the pins 5 thereof. The base i4 has two outwardly projecting contact pins I8 which are connected to the inwardly projecting spring contacts I9. When the lamp unit is assembled the pegs I9 press against the contacts 4 of the base 6 of said lamp device.

When the above described lamp unit is to be assembled the base 5 of the lampi is inserted into the sleeve I1 of the base I4, the pins 5 fitting into the slots in said sleeve I1, the lamp is rotated slightly to lock said base I4 and said lamp together. The lamp is then inserted into the heat conservator until conical base 3 comes into contact with the inner end of lead I3. The pins I5 on the ring I6 of the heat conservator 'I fit into slots in the base I4 and the base I4 is locked on said heat conservator by a slight rotation of these members and the assembly of the lamp unit is completed. The lamp unit is easily taken apart, when desired. The base I4 closes off the space between the inner wall 'I and the lamp container I from the outside atmosphere.

While I have shown and described the above lamp unit in conjunction with a sodium vapor lamp it will be understood of course that I contemplate the` use-of other types of lamps, such as mercury vapor lamps, or gas lamps in the lamp unit. The general effectiveness of a lamp unit comprising a sodium vapor lamp is increased by making the inner wall of the heat conservator of yellow glass, or by applying a yellow coating thereto.

What I claim as new and desire to secure by Letters Patent of the United States is:-

A lamp unit comprising an elongated gaseous electric discharge lamp device having electrodes and electrode leads sealed into the respective ends thereof, a heat conservator therefor, and a common base for said lamp and said conservator,

10 said conservator being a double Walled vessel open at one end and having a current lead at the closed end thereof, said base having an electrical contact thereon, said base being removably attached to said lamp and said conservator and supporting said lamp in said conservator, said base closing the end of said conservator, the contacts on said base and in said conservator being in Contact with the current leads at the respective ends of said lamp.

KURT WIEGAND. 

